Engine rotational speed variation amount detecting device and engine control device

Abstract

Provided is a rotational speed variation amount detecting device for a multi-cylinder four-cycle engine, which: detects a specific part of an alternating current voltage waveform output by a power generation coil provided for an ignition unit corresponding to each cylinder in the engine, and generates one rotation signal corresponding to each cylinder for each rotation of a crankshaft; detects, asa rotation signal generation interval of each cylinder each time a new rotation signal corresponding to each cylinder is generated, an elapsed time from the generation of the rotation signal corresponding to each cylinder in the previous cycle until the generation of the rotation signal in the current cycle; calculates, as a rotation signal generation interval variation amount each time the rotation signal generation interval for each cylinder is detected, a difference between the newly detected rotation signal generation interval for each cylinder and the rotation signal generation intervaldetected in the previous cycle for the same cylinder; and detects an amount of variation in the rotational speed of the engine on the basis of the rotation signal generation interval variation amount,thereby detecting the amount of variation in the rotational speed of the engine a plurality of times during one rotation of the crankshaft.

Description

technical field [0001] The present invention relates to a rotation speed change detecting device for detecting a change in the rotation speed of a multi-cylinder four-cycle engine, and to performing control gain calculation using the rotation speed change detected by the rotation speed change detecting device to control the engine. An engine control device for controlling the rotational speed to converge to a target rotational speed. Background technique [0002] An engine control device that performs feedback control to converge the rotational speed of the engine to a target rotational speed, as shown in, for example, Patent Document 1, includes, as basic components: an operation unit that is operated to adjust the rotational speed of the engine; The calculation part calculates the deviation between the actual rotational speed of the engine and the target rotational speed; the control gain setting part sets the control gain; the operation amount calculation part uses the de...

AI Technical Summary

Problems solved by technology

[0003] In this kind of control device, if the control gain is not set appropriately, when the rotational speed of the engine changes due to load fluctuations, overshoot or undershoot of the rotational speed will occur, which may cause the engine to overshoot or undershoot. The problem that it takes time for the speed to converge to the target rotation speed

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